Delay switch



Patented Jam 29, 1935 V UN ITED STATES,

issosu nmr swn-cn L: Moore, ChathmN-J. manna am :0, 1934, Serial No.132,40:

Claims. (01. 115-315) This application is a continuation in part of mytwo prior applications for patents Serial No.

540,287, filed May 2'1, 1931, and Serial'No. 616,450 filed June 10,1932, allowed June 23, 1933.

My present invention relatesalso to electric .de', lay switches forcontrolling the operation of electric elevators and other electricallycontrolled appliances, in which a predetermined time is alof thecontrolled apficiency of the delay switch. To attain these ob- :Iects inthe present embodiment of my invention, I provide a partial primaryappliance-operating circuit, of a power insufiicient by itself tooperate the appliance, but sufilcient to reduce the force, and shock ofthe full operating current on the appliance and a secondary controllingand partial operating circuit including a solenoid or equivalentelectric motor, and a main control switch, the arrangement being thatwhen the main 'control switch is closed, the solenoid will be energizedand first close the primary partial appliance-operating circuit; after adelay the solenoid will close the secondary partial appliance-operatingcircuit, which will in conjunction with the partial primary operatingcircuit operate the controlled appliance; on then opening the maincontrol switch the solenoid will be de-energized, the secondary partialoperating circuit will be opened and after a delay the primary partialoperating circuit will be opened, the operation of the appliancearrested, and the parts restored to theiroriginal position ready for thenext operation of the appliance.

In order that my invention may be fully understood I shall firstdescribe in detail the mode in which its present embodiment is carriedinto effect, and then point out the various features 45 of the inventionin the claims.

Reference is to'be had to the accompanying drawing forming part of thisapplication in which corresponding parts are designated by the same 50numbers in all the figures.

lowed between'the closing of the main control Figure 1 is a sectionalelevation partly diagrams!" matic, illustrating a delay switch embodyingmy adjusting the period of delay in the operation of the appliance.

In the drawing, 10 designates the source of current; 16 the controlledapparatus in this example an electric motor for moving an elevator to beoperated thereby; 13, 25, 46, 43, the primary partial operating circuitleading from, current source through the. controlled apparatus; 14, aswitch in said circuit; 11, 15, 39, 51, 21, a control circuit leadingfrom the current source to the terminal 24; 12 a main control switch insaid control circuit; 52, 53, atwo-way switch in said controlcircuit;40, 42, 43, a secondary partial operating circuit leading from thecontact 53 of the two-way switch 52, 53 through the con- 15 trolledapparatus;20, a solenoid fixed on the frame of the apparatus inthecontrol circuit 11,

15, 39, 51, 21, 24; 33, a piston-rod extending, through the solenoid andfixed immovably at its lower end to a bracket fixed to the frame of theapparatus; 32, a piston fixed on the upper end of the piston rod 33; 31,a non-magnetic cylinder fittedto work vertically on the piston 32. Thepiston is fitted loosely in thecylinder 3l, so that the air underpressure can pass slowly by the piston as the cylinder movesvertically'therein. The cylinder 31 is fixed on a plunger 27, fittedtomove vertically and freely in the solenoid 21,-the upper section of theplunger 27 being non-magnetic and its lower section iron so that so itwill be attracted and the plunger and cylinder pulled upward by thesolenoid 20 when energized.

In both the upper and lower ends of the cylinder 31, are provided shortby-passes 49, so that the cylinder will be freed of the air pressureproduced by its motion on the fixed loosely fitting piston, as the fixedpiston is approached by either end of the cylinder.

0n the lower end of the plunger 27 is fixed a pin or projection 26 whichis arranged, when the plunger reaches the end of its downward motion, tocontact the spring contact of the switch 14 and break the primarypartial operating circuit 13, 25, 46, 43. v

On the cylinder 31, fixed on the plunger 2'1, is fixed a verticallyadjustable projection 54, shown in detail in Figure 3, which, when theplunger reaches the upper end of its motion, is arranged to strike thedouble contact arm 51, of the twoway switch 52, 53, and move the doublecontact from the fixed contact 52 to the fixed contact 53.

The operation of' this vention is as follows:

When it is desired to operate the controlled appliance 16, after a delaywhich is predetermined by a proper vertical adjustment of the two-wayswitch-operating projection 54, the main control switch 12 is closed.

The current will then flow from the source 10, through the controlcircuit 15, 39, 21, 24, and the solenoid 20 therein, energizing thesolenoid, liiting the plunger 27, with its lower projection 26, and thusfreeing and closing the normally open switch 14. The primary partialoperating current will then fiow from the source 10 through the circuit,13, 25,46 and 43 through the controlled appliance 16. This primaryoperating circuit is provided with a suitable resistance- 47 so that theprimary operating current will not have power enough alone to start andoperate the appliance, but will greatly reduce the shock on theappliance when the secondary operating current is applied thereto afterthe predetermined delay as hereinafter described.

The plunger will then continue to rise slowly, owing to the upward pullof the solenoid, the rise of the plunger being slowed by the pressure01' the air in the cylinder below the pistons escaping slowly past itsperiphery.

when the lower end of the rising cylinder 31,

reaches the piston 32, the air is released by the lower by-pass 49. Atthe same time, the adjustable projection 54 on the cylinder 31, strikesthe two-way switch arm 51, and moves the double contact therein from thelower fixed contact 52, to the upper fixed contact 53, thus breaking thecontrol circuit 15, '39-, 21, 24, and closing the secondary partialoperating circuit 15, 39, 40, 42, 43, through the appliance 16.

This secondary operating current will then reinforce the primaryoperating current already exerting its force on the appliance andoperate the appliance without shock.

when the operation of the appliance is completed, the main controlswitch 12 is opened. The secondary partial operating circuit 15, 39, 40,42, 43, will then be broken, and the force on the appliance thus reducedto that extent. I

The solenoid in said circuit will at the same time be de-energized, andthe plunger being freed of air pressure by the lower cylinder by-pass49, will be retarded and fall slowly against the pressure .of the airabove said by-pass, until it reaches its lower position. It will then beagain freed of air pressure by the'upper cylinder bypass 49, for thenext 'operation. At the same time, the lower projection 29 on theplunger, will open the primary operating switch 14, and finally breakthe primary operatingcircuit 13, 25, 46, 43, thus arresting theoperation of the appliance without shock and after the delay desired.

It is evident that many modifications of this embodiment of my inventionmay be made without departing from the boundaries of my invention.

I claim as my invention:

1. Means for operating an electrically controlled appliance aiter adelay comprising a main control circuit including a main control switchand solenoid, a. cylinder and piston and means for causing the cylinderto be moved by the solenoid slowly relatively to the piston against theresistance of the air partially confined in the cylinder, a primarypartial operating circuit including a switch, means for operating theprimary partial operating switch by the initial relative movement of thecylinder and piston, a secondary partial operating circuit including aswitch, and means for operating the secondary partial operating switchby the delayed relative movement of the cylinder and piston so thatafter a delay the secondary operating circuit will combine with theprimary operating circuit to operate the appliance without shock, andwhen the main control switch is opened, the secondary operating circuitwill be de-energized and after a delay the primary operating circuitwill be deenergized and the operation 01 the appliance discontinued.

2. Means for operating an electrically controlled appliance after adelay in accord with claim 1, in which the switch in the secondarypartial operating circuit is a two-way'switch included also in the maincontrol circuit, and is operated by the delayed relative movement or thecylinderand piston, to switch the current from the main control circuitto the secondary partial operating circuit.

3. Means for operating an electrically controlled appliance after adelay in accord with claim 1, in which the solenoid and piston are fixedand the cylinder is fixed on a plunger moving vertically in thesolenoid, the lower part or the plunger being magnetic and the upperpart non-magnetic.

4. Means for operating an electrically controlled appliance aiter adelay in accord with claim 1, in which the solenoid and piston are fixedand the cylinder is movable and carries a projection which operates theswitch in the primary partial operating circuit.

5. Means for operating an electrically controlled appliance after adelay in accord with claim 1, in which the solenoid and piston are fixedand the cylinder is movable and carries a projection which operates theswitch in the sec-' ondary partial operating circuit.

6. Means for operating an electrically controlled appliance aiter adelay in accord with claim 1, in which the solenoid and piston are fixedand the cylinder is movable, the piston being loosely fitted within thecylinder to permit the air to pass slowly by the periphery of the pistonand the cylinder being provided with bypasses at each end to. i'ree thepiston of air pressure at each end 01' the movement of the cylinderthereon.

' L. MOORE.

